Helicity, Chirality, Mass, and the Higgs

My goal is to explain the sense in which the Standard Model is “chiral” and what that means. In order to do this, we’ll first learn about a related idea, helicity, which is related to a particle’s spin. We’ll then use this as an intuitive step to understanding the more abstract notion of chirality, and then see how masses affect chiral theories and what this all has to do with the Higgs.

I’m enjoying Dr. Tanedo’s series on the Standard Model. Simple, informative, accessible, and even though physics-by-analogy is fraught, very accurate. I especially like the little spin diagram above.

If you want to start at the beginning, and it is a very good place to start, go to http://www.quantumdiaries.org/2010/02/14/lets-draw-feynman-diagams/

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